The gate drags and will not latch: what you can fix yourself and when to call a pro

Find out what is sagging: the hardware, the frame or the post

You can often fix a sagging wood gate yourself if the problem is loose hinge screws, a worn latch or a gate frame that has racked slightly out of square; tightening or replacing hardware and adding an anti-sag brace or cable kit fixes many of these in an afternoon. If the gate post itself is leaning, loose in the ground or soft at the base, or the gate frame is cracked or rotten, the fix is structural and is usually a job for a fence builder. An automated gate is different again: do not adjust or repair the operator, sensors or gate yourself.

We build and repair wood and iron gates at Park Cities Fence & Deck, from simple walk-through gates to automated driveway gates. A gate is the hardest-working part of any fence. It moves every day, it hangs its whole weight off one side, and when it fails, the yard is suddenly not closed. This guide shows you how to diagnose yours, what you can safely do, and when to stop.

Why gates sag in the first place

A gate is a lever. All of its weight hangs from the hinges on one post, and the latch side has nothing holding it up but the frame. Over time that weight pulls the latch corner down. A wood frame without a proper diagonal brace slowly turns from a rectangle into a parallelogram. Hinge screws in wood work loose as the wood dries, swells and dries again. And the hinge post takes a twisting load every time the gate swings, which is why it is so often the first post on a fence to lean.

Weather speeds all of this up. Wood moves with moisture, so a gate that latched perfectly in a dry month can bind in a wet one. The clay soil common around Dallas swells after rain and shrinks in a dry spell, and that movement lets a post work loose in its footing. Kids swinging on a gate, a dog pushing on it, or a gate that blows open and slams against its stop all add stress the gate was never meant to take.

A quick diagnosis you can do in the yard

Open the gate halfway and lift the latch end gently. Watch the hinges. If the hinge screws pull in and out of the wood, or the hinge itself flexes, the problem is at the hinges. Now close the gate and look at the gap between the gate and the latch post from top to bottom. If the gap is wider at the top than the bottom, the gate is dropping on its latch side.

Next, put a level or a straight board against the hinge post. Push and pull the post firmly at the top. A post that is out of plumb or that rocks in the ground is the real cause, and nothing you do to the gate will fix it for long. Press a screwdriver into the base of the post at the soil line; if it sinks in easily, the post is rotting. Finally, check the gate frame itself: measure corner to corner across both diagonals. If the two measurements differ noticeably, the frame has racked out of square.

• Screws pulling out or hinge flexing: hardware problem
• Post leaning, rocking or soft at the base: post problem
• Diagonals unequal, joints separating: frame problem
• Gate drags only in wet weather: wood swelling or soil movement
• Latch misses but gate is square and post is plumb: latch alignment

What a homeowner can safely fix

If the post is solid and plumb and the frame is basically sound, most gate problems are within reach of a homeowner with a drill and a trip to the hardware store. Start with the hinges. Tighten every screw. If a screw spins without biting, the hole is stripped; a longer exterior screw that reaches fresh wood, or moving the hinge slightly to new wood, usually solves it. Replace hinges that are bent, rusted or worn at the pin.

If the frame has racked, an anti-sag kit, which is a steel cable with a turnbuckle, runs diagonally from the top hinge corner to the bottom latch corner. Tightening the turnbuckle pulls the latch corner back up. On a wood gate that never had a diagonal brace, adding one that runs from the bottom hinge corner up to the top latch corner does the same job permanently. Once the gate is square again, realign the latch: loosen it, close the gate, mark the new position and refasten.

Iron gates have their own version of this. Worn hinge pins and rust at the hinges and latch are the usual culprits. As our repair page describes, loose rust can be taken off with a steel brush, a rust converter stabilizes what remains, and the metal is then primed with an anti-rust primer and finished. A homeowner can handle light surface rust; a sagging iron gate with a cracked weld or a moving post needs a fence builder.

• Tighten all hinge and latch screws
• Replace stripped screws with longer exterior-rated screws into sound wood
• Replace bent or rusted hinges with ones sized for the gate weight
• Add an anti-sag cable and turnbuckle, or a diagonal wood brace
• Realign the latch and strike once the gate is square
• Clear soil, mulch or stone that has built up under the gate's swing

Where DIY stops

Stop when the post is the problem. A leaning or loose hinge post has to be reset or replaced, which means digging out the old footing, setting a new post in fresh concrete, plumbing it, letting it cure and then rehanging the gate. Gate posts carry a swinging load and should be sized for the weight of the gate. If the original post was undersized, resetting the same post in the same way gives you the same sag in a year or two.

Stop when the frame is rotten or broken. A cable kit will hold up a sound but racked frame; it will not hold a frame whose joints are soft. And stop before any digging. Post holes go where buried lines may run, and an 811 utility locate should come first. If several posts along the fence are also leaning, the gate is the symptom of a bigger problem, and my guide on repairing or replacing a leaning fence will help you size it up.

Pool gates and security gates cannot wait

If the gate encloses a pool, a gate that does not latch on its own is a safety problem, not a cosmetic one. The U.S. Consumer Product Safety Commission's pool barrier guidelines recommend that pedestrian gates in a pool barrier open outward, away from the pool, and be self-closing and self-latching. If your pool gate no longer swings shut and latches by itself from any open position, keep children away from the area and get it fixed promptly.

The same goes for a gate that secures a dog, an alley or the side of the house. A gate that does not close is an open door into the backyard. If security is part of why you are thinking about the gate, the guide to what actually protects a house after a break-in nearby is worth reading alongside this one.

Automated gates are not a DIY project

A gate with a motor is a different machine. The Door and Access Systems Manufacturers Association's guidelines for automatic vehicular gates state plainly that end users should never attempt to repair the gate and should contact a trained gate systems technician. They also warn owners never to overtighten the operator's clutch or force setting to make up for a damaged or stiff gate, and to stop using the gate if its safety systems are not working properly.

So if an automated gate is sagging, dragging or stopping short, switch it off and use the manual release as the manufacturer instructs, keep people clear of it, and call a professional. Very often the motor is fine and the real problem is the gate or its post, which is exactly the part a fence company fixes. For more on how automated gates should be set up, see my guide to adding an automatic driveway gate.

Building a gate that does not sag again

When we build or replace a gate, most of the work goes into the parts you do not notice. The hinge post is set deeper and heavier than a line post. The frame is built square and braced. Hinges and latches are sized for the weight of the gate, and the gate is hung with enough clearance at the bottom to swing over the ground without dragging as the seasons change. On wide openings, a double gate or a slide gate can make more sense than one very heavy swing gate.

Finish matters too. A wood gate that is stained and kept stained moves less with moisture than bare gray wood, so it stays square longer. If the rest of your fence is weathered, our guide to when a fence needs restaining helps you decide whether to refinish the fence while the gate is being fixed.

What happens when you call us about a gate

Send us your address, a photo of the gate open and closed, and a sentence about what it is doing. I come out, check the post, the frame and the hardware, and tell you which one is the problem. If it is a quick hardware fix you can do yourself, I will say so. If the post or frame needs work, or you want a new gate, you receive a free written estimate with a timeline.

We add walk-through and driveway gates to existing fences, replace failing gates, and automate gates with motors, keypads, remotes and safety sensors. Posts and hardware are sized for the gate so it keeps closing properly for years. We work across Dallas-Fort Worth, for homeowners, HOAs and commercial properties, and I walk every finished job with the owner.

Questions people ask me